/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.neo4j.cypher.internal.util

sealed trait ZeroOneOrMany[+T]

object ZeroOneOrMany {

  def apply[T](elts: Seq[T]): ZeroOneOrMany[T] = elts match {
    case Seq()    => Zero
    case Seq(one) => One(one)
    case many     => Many(many)
  }
}

case object Zero extends ZeroOneOrMany[Nothing]
final case class One[T](value: T) extends ZeroOneOrMany[T]
final case class Many[T](values: Seq[T]) extends ZeroOneOrMany[T]
